Add tasks for all the new languages

Task/Sorting-algorithms-Strand-sort/Sidef/sorting-algorithms-strand-sort.sidef

@@ -0,0 +1,36 @@
+func merge(x, y) {
+    var out = [];
+    while (x && y) {
+        given (x[-1] <=> y[-1]) {
+            when ( 1) { out.prepend(x.pop) }
+            when (-1) { out.prepend(y.pop) }
+            default   { out.prepend(x.pop, y.pop) }
+        }
+    }
+    x + y + out;
+}
+
+func strand(x) {
+    x || return [];
+    var out = [x.shift];
+    if (x.len) {
+        for i in (-x.len .. -1) {
+            if (x[i] >= out[-1]) {
+                out.append(x.pop_at(i));
+            }
+        }
+    }
+    return out;
+}
+
+func strand_sort(x) {
+    var out = [];
+    while (var strd = strand(x)) {
+        out = merge(out, strd);
+    }
+    return out;
+}
+
+var a = 10.of { 100.irand };
+say "Before: #{a}";
+say "After: #{strand_sort(a)}";